header {
  display: none;
  position: absolute;
  top: 0px;
  //width: 100vw;
  //height: 100vh;
}
header .nav_content {
  width: 90%;
  text-align: center;
  color: white;
  margin: 0 auto;
}
header .nav_content img {
  width: 70%;
  margin-top: 50px;
  -ms-interpolation-mode: nearest-neighbor;
  image-rendering: optimizeSpeed;
}
header .nav_content h1 {
  font-size: 2.0em;
}
header .nav_content a {
  text-transform: uppercase;
  font-size: 1.4em;
  font-weight: 800;
  line-height: 35px;
  display: block;
  color: #9F2F1C;
}
.content {
  position: relative;
  //top: 105vh;
  margin: 10px 0px 0px 0px;
}
.content section h2 {
  line-height: 30px;
}
.content section {
  font-size: 1.2em;
  line-height: 22px;
  text-align: left;
  margin: 0px 20px 0px 20px;
}
.content section .chapter_image {
  width: 100%;
  height: 25vh;
  background-size: cover;
  background-position: center;
}
.content section .content_element, .content section .content_element video {
  height: 250px;
  max-width: 100%;
  overflow: scroll;
}
footer {
  font-size: 1.2em;
  margin-top: 20px;

  text-align: center;
  padding: 5px;
  color: white;
  font-size: 1.2em;
  line-height: 27px;
}
footer > a {
  display: block;
  color: black;
}
.content section p.spalten {
  -webkit-column-count: 1;
  -moz-column-count: 1;
  column-count: 1;
}
#triangle {
    width: 100%;
}